MQE-693: [ActionGroup] Characters "[" and "]" must be allowed in selector/url parameters

- added [ and ] to regex in actionGroupObject.

Author: KevinBKozan

src/Magento/FunctionalTestingFramework/Test/Objects/ActionGroupObject.php

@@ -105,7 +105,7 @@ private function getResolvedActionsWithArgs($arguments, $actionReferenceKey)
         // $regexPattern match on:   $matches[0] {{section.element(arg.field)}}
         // $matches[1] = section.element
         // $matches[2] = arg.field
-        $regexPattern = '/{{([\w.\[\]]+)\(*([\w.$\',\s]+)*\)*}}/';
+        $regexPattern = '/{{([\w.\[\]]+)\(*([\w.$\',\s\[\]]+)*\)*}}/';
 
         foreach ($this->parsedActions as $action) {
             $varAttributes = array_intersect($this->varAttributes, array_keys($action->getCustomActionAttributes()));